[lnkForumImage]
TotalShareware - Download Free Software
Confronta i prezzi di migliaia di prodotti.
Asp Forum
 Home | Login | Register | Search 


 

Forums >

comp.lang.ruby

Re: [QUIZ] Fractals (#125

email55555 email55555

5/31/2007 2:14:00 AM

#---------------------------------------------------------------------#
# #
# Program : Fractals (Ruby Quiz #125) #
# Author : David Tran #
# Date : 2007-05-30 #
# Blog : http://davidtran.doublegifts.com/... #
# Reference : http://mathworld.wolfram.com/PerpendicularV... #
# Note : Using vector calculation to compute each level's #
# points. The first level line can be in any direction. #
# #
#---------------------------------------------------------------------#
require 'enumerator'
require 'RMagick'

LEVEL_0 = [[0, 0], [350, 200]]

def next_level(polylines)
polylines.enum_cons(2).inject([polylines.first]) do |array, (p1, p2)|
x1, y1 = p1
x2, y2 = p2
a = (x2 - x1) / 3.0
b = (y2 - y1) / 3.0
array << [x1+a, y1+b] << [x1+a-b, y1+b+a] <<
[x1+2*a-b, y1+2*b+a] << [x1+2*a, y1+2*b] << p2
end
end

exit unless __FILE__ == $0
imageList = Magick::ImageList.new
level = LEVEL_0
(ARGV[0].to_i + 1).times do |i|
level = next_level(level) if i > 0
image = Magick::Image.new(400, 300)
image.delay = 100
draw = Magick::Draw.new
draw.fill_opacity(0)
draw.stroke('black')
draw.polyline(*level)
draw.text(300,100,"level #{i}")
draw.draw(image)
imageList << image
end
imageList.write(File.basename($0) + ".gif")